The first batteries are 2,000 years old
2000年前誕生的電池

      In 1938, while in Baghdad, German archeologist Wilhelm König discovered a five-inch-long (13 cm) clay jar containing a copper cylinder that surrounded an iron rod. The jar showed signs of corrosion and seemed to have once contained a mild acid, such as vinegar or wine. König believed these vessels to be galvanic cells, or parts of batteries, possibly used for electroplating gold onto sliver objects. The dates of the artifacts are obscure. König dated them to around 250 BC to AD 224, while others have suggested a range of AD 225-640. Of course, even if the vessels did produce electric currents, this does not imply that ancient people understood how the objects worked.
      1938年，德國(guó)考古學(xué)家瓦利哈拉姆·卡維尼格在巴格達(dá)地區(qū)發(fā)現(xiàn)了一個(gè)長(zhǎng)5英寸（約13厘米）的陶罐，里面裝有一根銅管，外層由鐵棒環(huán)繞。這個(gè)陶罐有腐蝕的痕跡，并且疑似曾經(jīng)盛放過(guò)弱酸類液體，如醋或酒。卡維尼格認(rèn)為，這些容器是原電池，或者是電池的組成部分，可能是用來(lái)把黃金電鍍到銀器上時(shí)使用的。這些人造物的年代不詳，卡維尼格覺(jué)得在公元前250年到公元224年之間，其他專家則判斷其年代在公元225年到640年之間。當(dāng)然，即使這些器皿確實(shí)可以發(fā)電，也不意味著古人就能明白其工作的原理。

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